Studies on topical antiinflammatory corticosteroids. II Synthesis and vasoconstrictive activity of 11.BETA.,17.ALPHA.,21-trihydroxy-6.ALPHA.-methyl-1,4-pregnadiene-3,20-dione 17-methoxy- and (methylthio)acetates.
On the utility of α-heteroatom substituted orthoesters in the Johnson Claisen rearrangement
作者:Todd R. Elworthy、David J. Morgans、Wylie S. Palmer、David B. Repke、David B. Smith、Ann Marie Waltos
DOI:10.1016/s0040-4039(00)73290-4
日期:1994.7
α-Heteroatom substituted orthoesters were prepared and found to undergo the Johnson Claisen rearrangement with a variety of allylicalcohols giving γ,δ-unsaturated α-heteroatom substitutedesters in fair to excellent yields. The diastereoselectivity of the process was examined.