3,3′-Anisyl-Substituted BINOL, H<sub>4</sub>BINOL, and H<sub>8</sub>BINOL Ligands: Asymmetric Synthesis of Diverse Propargylic Alcohols and Their Ring-Closing Metathesis to Chiral Cycloalkenes
作者:Yang Yue、Mark Turlington、Xiao-Qi Yu、Lin Pu
DOI:10.1021/jo9018446
日期:2009.11.20
aldehydes. It catalyzed the reactions of alkyl propiolates with 88−99% ee; the reactions of phenylacetylene with 81−87% ee; the reactions of 4-phenyl-1-butyne, an alkyl alkyne, with 77−89% ee; and the reactions of trimethylsilylacetylene with 92−97% ee. The optically active propargylic alcohols generated from this catalytic asymmetric alkyne addition were observed to undergo efficient ring-closing-metathesis
制备了一系列光学活性的BINOL,H 4 BINOL和H 8 BINOL衍生物。这些化合物与ZnEt 2和Ti(O i Pr)4结合用于在室温下催化炔烃与醛的不对称反应以生成手性炔丙醇。通过比较研究,发现3,3'-双茴香基取代的H 8 BINOL(S)-7已发现其是通常的对映选择性催化剂,其用于结构多样的末端炔烃与各种醛的反应。它催化了ee值为88-99%的丙酸烷基酯的反应。苯乙炔与ee为81-87%的反应; 4-苯基-1-丁炔,一种烷基炔,与77-89%ee的反应;和三甲基甲硅烷基乙炔与92-97%ee的反应。观察到由这种催化不对称炔烃加成产生的旋光性炔丙醇在Grubbs II催化剂的存在下进行了有效的闭环复分解(RCM)反应,生成了手性环烯烃。进一步发现,一些手性炔丙基醇进行了高度化学选择性的串联RCM氢化反应,同时保留了对映体纯度。