Stereoselective synthesis of (Z)-α-(hydroxyalkyl)-β-iodoacrylates (=(2Z)-2-(hydroxyalkyl)-3-iodoprop-2-enoates) was achieved in a one-pot coupling reaction from methyl prop-2-ynoate, Me3SiI, and an alkanal under mild conditions with MgI2 as catalyst ( 1–9; see Table and Scheme 1). Baylis-Hillmanβ-iodo adducts were generated in excellent yields with high (Z)-selectivity. The conversion of methyl prop-2-ynoate
(Z)-α-(羟烷基)-β-
碘代
丙烯酸酯(=(2 Z)-2-(羟烷基)-3-
碘代
丙-2-烯酸酯)的立体选择性合成是通过甲基丙-的一锅偶联反应实现的。 2-
壬酸酯,Me 3 SiI和链烷醛在温和条件下以MgI 2为催化剂(1 – 9;参见表和方案1)。的Baylis-希尔曼β在具有高(优异的产率产生了
碘加成物Ž) -选择性。甲基丙-2-炔酸甲酯与活性3-
碘-1-转换- [(三甲基甲
硅烷基)氧基] allenolate中间原位建议随后进行羰基加成作为反应顺序(方案1和2)。