Conformationally Constrained Analogues of Diacylglycerol. 24. Asymmetric Synthesis of a Chiral (<i>R</i>)-DAG-Lactone Template as a Versatile Precursor for Highly Functionalized DAG-Lactones
作者:Ji-Hye Kang、Maqbool A. Siddiqui、Dina M. Sigano、Krzysztof Krajewski、Nancy E. Lewin、Yongmei Pu、Peter M. Blumberg、Jeewoo Lee、Victor E. Marquez
DOI:10.1021/ol0492041
日期:2004.7.1
2-methylenepropane-1,3-diol was converted to chiral epoxide (R)-2 via Sharpless asymmetric epoxidation in >96% ee. Regiospecific epoxide ring opening and reduction of the intermediate alkyne set the stage for a one-pot lactonization to give (R)-6, a convenient precursor for all functionalized chiral DAG-lactones used as potent PK-C ligands. The synthesis of the most potent DAG-lactones known to date
[结构:见正文]通过> 96%ee的Sharpless不对称环氧化,将市售的2-亚甲基丙烷-1,3-二醇转化为手性环氧化物(R)-2。区域特异性环氧化物的开环和中间炔烃的还原为单锅内酯化提供了条件,以得到(R)-6,这是用作功能强大的PK-C配体的所有官能化手性DAG内酯的便利前体。迄今为止已知的最有效的DAG内酯(Z)-10和(E)-10的合成,证实了PK-C在此类化合物中对(R)-立体化学的排他性偏好。