Construction of adjacent spiro-quaternary and tertiary stereocenters through phosphine-catalyzed asymmetric [3+2] annulation of allenoates with alkylidene azlactones
作者:De Wang、Yin Wei、Min Shi
DOI:10.1039/c2cc17709a
日期:——
A novel axially chiral spiro-phosphine-catalyzed highly regio-, diastereo- and enantioselective [3+2] cycloaddition of alkylidene azlactones with various allenic esters has been developed, affording the corresponding functionalized spirocyclic products in moderate to excellent yields under mild conditions. These spirocyclic products as masked amino acids can be easily transformed into aspartic amino
已开发出一种新型的轴向手性螺膦催化的亚烷基氮杂内酯与各种烯丙基酯的高度区域,非对映和对映选择性[3 + 2]环加成反应,可在温和条件下以中等至优异的收率提供相应的官能化螺环产物。这些螺环产物作为被掩盖的氨基酸可以容易地转化为天冬氨酸类似物。