The first primary aminocatalytic direct cross-aldol reaction of acetaldehyde is presented. Among the various vicinal diamines screened, the L-tert-leucine derivative 1c in conjunction with (H4SiW12O40)0.25 was identified as the optimal catalyst; good catalytic activity (up to 99 % yield in 4 h), and high enantioselectivities (up to 92 % ee) were achieved for a range of donors, including aromatic aldehydes
Crossed‐aldol reaction: The synthesis of (R)‐convolutamydine E has been achieved by the crossed‐aldol reaction of acetaldehyde with 4,6‐dibromoisatin (1: X = Y = Br) by using a bifunctional organocatalyst. This strategy allows the enantioselectivesynthesis of (R)‐convolutamydine E derivatives and convolutamydine B.
交叉醛醇缩合反应:使用双功能有机催化剂,通过乙醛与4,6-二溴异丁香苷的交叉醇醛缩合反应(1:X = Y = Br)合成了(R)-卷积环糊精E。这种策略允许对映体选择性合成(R)-convolutamydine E衍生物和convolutamydine B.