LaCl<sub>3</sub> · 7H<sub>2</sub>O‐Promoted Regioselective Ring Opening of Epoxides Using NaNO<sub>2</sub>in Ether–Water System: A Facile Synthesis of 2‐Nitroalcohols
作者:Jagat C. Borah、Siddhartha Gogoi、Joshodeep Boruwa、Nabin C. Barua
DOI:10.1081/scc-200051043
日期:2005.3
Abstract A convenient and efficient synthesis of 2‐nitroalcohols has been achieved by regioselective ringopening of epoxides using LaCl3 · 7H2O and NaNO2 in ether–H2O system at room temperature. The reaction afforded the corresponding products in good to excellent yields under mild conditions.
Synthesis of 2-Nitroalcohols by Regioselective Ring Opening of Epoxides with MgSO4/MeOH/NaNO2 System: A Short Synthesis of Immunosuppressive Agent FTY-720
作者:Biswajit Kalita、Nabin C. Barua、Maitreyee (Sarma) Bezbarua、Ghanashyam Bez
DOI:10.1055/s-2001-16776
日期:——
It has been demonstrated that a variety of epoxides can easily be opened with a system consisting of MgSO4/MeOH/NaNO2 giving the corresponding 2-nitroalcohols in excellent yields. This strategy has been applied to achieve a short synthesis of Immunosuppressive Agent FTY-720.
Allev,I.A. et al., Journal of Organic Chemistry USSR (English Translation), 1970, vol. 6, p. 2185 - 2188
作者:Allev,I.A. et al.
DOI:——
日期:——
2-Amino-2-deoxytetrose Derivatives. Preparation from 4,5-Dihydroisoxazoles via Reductive Cleavage
作者:Peter A. Wade、Stephen G. D'Ambrosio、David T. Price
DOI:10.1021/jo00125a015
日期:1995.10
The 4-alkoxy-3-nitro-4,5-dihydroisoxazoles 2a,b were prepared by condensation of nitromethane and chloroacetaldehyde, protection of the resulting nitroaldol Ic, and subsequent nitrosative cyclization. Multistep replacement of the nitro group of 2a,b by a 2-(1,3-dithiolanyl) group gave 7a,b. Reaction of 7b with lithium borohydride afforded reductive cleavage of the dihydroisoxazole ring to produce the open-chain diastereomeric amino alcohols 6a,b. A reproducible ratio of > 90: 10 6a/6b was obtained using freshly prepared hydride reagent. The amino alcohols were converted to the corresponding (R*,R*)-amide 6c and (R*,S*)-amide 6d which were chromatographically separated. The(R*,R*)-amide was transformed into the 2-amino-2-deoxythreose derivatives 11a,b and hence to 12 while the (R*,S*)-amide was similarly transformed to 2-amino-2-deoxyerythrose derivative 14a and its anomeric isomer 14b.
262. Infrared absorption spectra of aliphatic nitro-alcohols. Part I. Spectra of monohydric nitro-alcohols and their chloro- and bromo-derivatives