Efficient Organocatalytic Cross-Aldol Reaction between Aliphatic Aldehydes through Their Functional Differentiation
作者:Taichi Kano、Hisashi Sugimoto、Keiji Maruoka
DOI:10.1021/ja208873k
日期:2011.11.16
stereoselective asymmetric directcross-aldolreactionbetween aliphatic aldehydes and α-chloroaldehydes has been developed as a method for the formation of the sole cross-aldol adduct with both enantio- and diastereocontrol, and either anti- or syn-aldol adducts were obtained in good to excellent stereoselectivities by use of proline or a novel axiallychiralaminosulfonamide as catalyst.
Asymmetric Aldol Reaction of Allenoates: Regulation for the Selective Formation of Isomeric Allenyl or Alkynyl Aldol Adduct
作者:Jiyun Bang、Hyuna Kim、Jihyun Kim、Chan-Mo Yu
DOI:10.1021/acs.orglett.5b00454
日期:2015.3.20
A highly stereoselective synthesis of 3-butynyl-threo-aldol adducts is achieved from the reaction of allyl allenoate with a chiral bromoborane in the presence of iPr2NEt, followed by addition of BF3·OEt2 as an additive to scavenge excess base and then aldehydes, whereas isomeric allenyl aldol adducts are formed in the absence of a Lewis acid additive from methyl allenoate.