Advanced Organic Reactions by Rizzo C.J.
By Rizzo C.J.
Read Online or Download Advanced Organic Reactions PDF
Similar organic chemistry books
Detect how the newest advancements in biotechnology, genomics, and proteins at once have an effect on your lifestyles with Campbell/Farrell? s best-selling biochemistry textual content. identified for its logical association and acceptable intensity of insurance, BIOCHEMISTRY, 6th version, balances medical aspect with clarity that?
Presents the newest advancements in natural chemistry. Compiled by way of well-respected editors with decades of suitable event.
The lengthy awaited new version of this finished two-volume reference has been thoroughly up to date and improved via 30% to incorporate chapters on ionic beverages, carbohydrate chemistry, multicomponent reactions, good part peptide synthesis, carbon nanotubes and fullerenes. Written via the main eminent scientists of their respective fields, the chapters, which enhance each other, now additionally comprise 8 new fields of software, comparable to heterocyclic chemistry, cycloadditions and carbohydrate chemistry.
- Synthesis of carbon-phosphorus bonds
- Protective groups in organic synthesis
- Hypervalent Iodine in organic synthesis
- Houben-Weyl Methods in Organic Chemistry: Photochemistry (4/5a)
Extra resources for Advanced Organic Reactions
Ber. 1984, 117 , 856. Ar-NO2 → Ar-NH2 Ar-NO → Ar- NH2 R2C=N-OH → R2CH-NH2 NaBH4 / TiCl 4 Synthesis 1980, 695. R-COOH → R-CH2-OH R-COOR' → R-CH2-OH R-CN → R-CH2-NH2 R-CONH2 → R-CH2-NH2 R2C=N-OH → R2CH-NH2 R-SO2-R' → R-S-R' NaBH4 / CeCl 3 Luche Reduction reduced α,β-unsaturated ketones in a 1,2-fashion OH NaBH 4/ CeCl3 R R NaBH 4 R R O OH O R + R R R R R R H R JCSCC 1978, 601 JACS 1978, 100 , 2226 O OH CO 2Me NaBH 4/ CeCl3 C 5H11 CO 2Me MeOH C 5H11 OH OH - selective reduction of ketones in the presence of aldehydes.
Hydroxyl groups Ketones and aldehydes Amines Carboxylic Acids - Protect functional groups which may be incompatible with a set of reaction conditions - 2 step process- must be efficient - Selectivity a. selective protection b. selective deprotection Hydroxyl Protecting Groups Ethers Methyl ethers R-OH → R-OMe Formation: Cleavage: - difficult to remove except for on phenols CH2N2, silica or HBF4 NaH, MeI, THF AlBr3, EtSH PhSe Ph2P Me3SiI OMe O OH O AlBr3, EtSH TL 1987, 28 , 3659 O O OBz Methoxymethyl ether MOM R-OH → R-OCH2OMe OBz stable to base and mild acid Formation: - MeOCH2Cl, NaH, THF - MeOCH2Cl, CH2Cl2, iPr2EtN Cleavage - Me2BBr2 TL 1983, 24 , 3969 PROTECTING GROUPS Methoxyethoxymethyl ethers (MEM) R-OH → R-OCH2OCH2CH2OMe stable to base and mild acid Formation: - MeOCH2CH2OCH2Cl, NaH, THF - MeOCH2CH2OCH2Cl, CH2Cl2, iPr2EtN Cleavage - Lewis acids such as ZnBr2, TiCl4, Me2BBr2 TL 1976, 809 S B Cl MEM-O HO S C5H11 O-Si(Ph)2tBu O C5H11 TL 1983, 24 , 3965, 3969 O O-Si(Ph)2tBu - can also be cleaved in the presence of THP ethers Methyl Thiomethyl Ethers (MTM) R-OH → R-OCH2SMe Stable to base and mild acid Formation: - MeSCH2Cl, NaH, THF Cleavage: - HgCl2, CH3CN/H2O - AgNO3, THF, H2O, base Benzyloxymethyl Ethers (BOM) R-OH → R-OCH2OCH2Ph Stable to acid and base Formation: - PhOCH2CH2Cl, CH2Cl2, iPr2EtN Cleavage: - H2/ PtO2 - Na/ NH3, EtOH Tetrahydropyranyl Ether R-OH (THP) O H + , PhH Formation Cleavage: R O O Stable to base, acid labile - DHP (dihydropyran), pTSA, PhH - AcOH, THF, H2O - Amberlyst H-15, MeOH Ethoxyethyl ethers (EE) JACS 1979, 101 , 7104; JACS 1974, 96 , 4745.
Ed. 1965, 254 - Only reduces double bonds - Syn addition of H 2 - will selectivley reduce the more strained double bond - Unstable reagent which is generated in situ K+O2C-N=N-CO2K+ + AcOH → H-N=N-H H2N-NH2 + Cu2+ + H2O2 → H-N=N-H HN=NH ACIEE 1965, 271 (76%) O O +- CO 2MeK O 2C N N CO 2- K+ CO 2Me AcOH, MeOH (95%) NO 2 JACS 1986, 108 , 5908 NO 2 O HN HN hν (254 nm) S NH NH + COS + CO O O S O N N H H TL 1993, 34, 4137 hν, 16 hr (96%) Metal Hydrides Review on Metal Hydride Selectivity: Chem Soc Rev.