申请人:Felzmann Wolfgang
公开号:US20140081016A1
公开(公告)日:2014-03-20
The invention refers to the selective acylation of Rapamycin at the 42-position (I) with an acylating agent of the formula (II) wherein R
4
and R
5
are the same or different, individually the rest of an acetal, especially tetrahydropyran, or of a carbonate or the rest of a silyl ether or taken together are the rest of a boronate, an acetal or ketal.