High diastereoselective vinylogous Mannich reaction induced by O-pivaloylated d-galactosylamine as the chiral auxiliary: stereoselective synthesis of 8-arylazocan-2-one
作者:Bing Cui、Gang Hou、Yan Cai、Zhiwei Miao
DOI:10.1016/j.carres.2013.03.020
日期:2013.6
The diastereospecific formation of β-N-glycosidically linked α,β-unsaturated δ-amino aldehyde derivatives has been achieved with high yield via a vinylogous Mannich reaction. The reaction was performed by using a O-pivaloylated galactosyl amine as a chiral template and AlCl3 as a promoter in THF. (S)-8-(p-Nitrophenyl) azocan-2-one can be stereoselective synthesized from (S) ethyl 7-galactosylamino
The diastereospecific formation of β‐N‐glycoside‐linked α‐amino phosphonic acid derivatives has been achieved in high yield by a Mannich‐type reaction. The reaction was performed by using O‐pivaloylated galactosylamine as a chiral template and SnCl4 as a promoter in THF (see scheme).
of adjacent P,C-stereogenic β-N-glycosidic linked α-aminophosphinates is developed in high yields via a phospha-Mannich reaction. The reaction was performed by employing (Rp)-O-(−)-menthyl H-phenylphosphinate and O-pivaloylated N-galactosylimine for double stereodifferentiation and BF3·Et2O as a promoter in THF. O-Pivaloylated N-galactosylphenyl imine 2 and (Rp)-O-(−)-menthyl H-phenylphosphinate 1 were
Carbohydrates as chiral templates: diastereoselective synthesis of N-glycosyl-N-homoallylamines and .beta.-amino acids from imines
作者:Sabine Laschat、Horst Kunz
DOI:10.1021/jo00020a033
日期:1991.9
Complexing properties and chirality of carbohydrates were utilized in diastereoselective reactions of O-pivaloylated N-galactosylimines with allylsilanes and -stannanes. With allyltrimethylsilane in the presence of SnCl4, imines 2 of aromatic and heteroaromatic aldehydes were converted to homoallylamines 3, giving ratios of diastereomers higher than 7:1. No addition products derived from alpha-anomeric aromatic imines were formed. Aliphatic homoallylamines 3 were synthesized by using allyltributylstannane in the presence of SnCl4. Both alpha- and beta-anomeric aliphatic imines reacted with the allylstannane. They gave the same ratio of diastereomers and showed the same sense of asymmetric induction.