Synthesis of Chiral Hydroxyl Phospholanes from <scp>d</scp>-mannitol and Their Use in Asymmetric Catalytic Reactions
作者:Wenge Li、Zhaoguo Zhang、Dengming Xiao、Xumu Zhang
DOI:10.1021/jo000066c
日期:2000.6.1
Strategies for protection and deprotection of OH-groups in the presence of phosphines have been explored. Rate acceleration in the Baylis-Hillman reaction was observed when a hydroxyl phosphine was used as the catalyst. Rhodium complexes with chiral bisphospholanes are highly enantioselective catalysts for the asymmetric hydrogenation of various kinds of functionalized olefins such as dehydroamino
手性羟基一膦3 [(2S,3S,4S,5S)-3,4-二羟基-2,5-二甲基-1-苯基膦烷]和双膦酸酯5a [1,2-双[(2S,3S,4S,5S) -3,4-二羟基-2,5-二甲基磷杂环戊烷基]苯]和5b [1,2-双[(2S,3S,4S,5S)-2,5-二乙基-3,4-二羟基磷杂环戊基]苯]从现成的D-甘露醇中以高收率获得。已经研究了在膦存在下保护和脱保护OH-基团的策略。当使用羟基膦作为催化剂时,在Baylis-Hillman反应中观察到速率加速。铑与手性双膦酸酯的络合物是高度对映选择性的催化剂,用于各种官能化烯烃(如脱氢氨基酸衍生物,衣康酸衍生物和烯酰胺)的不对称氢化。