Biomimetic total synthesis of steroids X. Synthesis of 7-(methoxymethyl)- and 7-(phenylmethoxymethyl)-19-norsteroids
作者:M. B. Groen、F. J. Zeelen
DOI:10.1002/recl.19861051206
日期:——
Cationic cyclization of 2-[6-(m-methoxyphenyl)-5-(methoxymethyl)-(E)-3-hexenyl]-3- methyl-2-cyclopentenol 23a and of the phenylmethoxymethyl analogue 23b has been studied. Although oxygen participation with the cyclization by the ether group is possible, and was observed, cyclization to steroids remains the major pathway.