Diastereoselective cyclopropanation via homochiral ketals. Dioxolane structural effects
作者:Eugene A Mash、Keith A Nelson、Phillip C Heidt
DOI:10.1016/s0040-4039(00)95995-1
日期:1987.1
series of 2-cyclohexen-1-one ketals related to 2-cyclohexen-1-one 1,4-di- O-benzyl-L-threitol ketal but possesing different dioxolane appendages was prepared and subjected to Simmons-Smith cycloproponation. The observed diastereoselectivity decreased when oxygen was present in the appendages. In the absence of appendage oxygen, the sense of the observed diastereoselectivity was found to depend upon dioxolane
制备了一系列与2-环己烯-1-酮1,4-二-O-苄基-L-苏糖醇缩酮有关但具有不同二氧戊环附属物的2-环己烯-1-酮缩酮,并对其进行了Simmons-Smith环丙化。当附件中存在氧气时,观察到的非对映选择性降低。在没有附肢氧的情况下,发现观察到的非对映选择性取决于二氧戊环的手性。观察到的非对映选择性的量明显与附属物的性质无关。