A straightforward preparation of both enantiomerically pure 2-O-benzyl-erythro-butanetetrols
摘要:
A short and efficient synthesis of both enantiomerically pure 2-O-benzyl-erythro-butanetetrols 4 and ent- 4 from the readily available D-erythronolactone 1 is presented. The synthesis proceeds in a highly efficient manner and is in both cases substrate controlled.
structural specificity of the glycosyl acceptor of the transglycosylationreaction using endo-beta-N-acetylglucosaminidase (ENGase) (EC 3.2.1.96) from Mucor hiemalis (Endo-M), several acceptor derivatives were designed and synthesized. The narrow regions of the 1,3-diol structure from the 4- to 6-hydroxy functions of GlcNAc were found to be essential for the transglycosylationreaction using Endo-M
Asymmetric Aldol Reaction of Glyoxal Catalyzed by Diarylprolinol
作者:Yujiro Hayashi、Masahiro Kojima
DOI:10.1002/cctc.201300247
日期:2013.10
All selection should be this eeasy: The directasymmetricaldolreaction of commercial aqueous glyoxal is catalyzed by trifluoromethyl‐substituted diarylprolinol 1 to afford a β‐formyl‐β‐hydroxy‐α‐substituted aldehyde in good yield with excellent anti selectivity and excellent enantioselectivity.
所有选择都应该是这个 ee asy:三氟甲基取代的二芳基脯氨醇1催化商业乙二醛水溶液的直接不对称醛醇缩合反应,可制得高效的β-甲酰基-β-羟基-α-取代醛,具有出色的抗选择性和出色的对映选择性。