Synthesis and structure-activity relationships of new non-steroidal progesterone receptor ligands
摘要:
In order to study structure-activity relationships, a series of new non-steroidal progesterone receptor ligands based on PF1092A (1)) was synthesized with structural modifications (mostly introduction or removal of a methyl group) at the 3-, 4-, 5-, 7- or 9-position in the 6-acetoxy-4a, 5, 6, 7-tetrahydro-3, 4a, 5-trimethylnaphtho[2, 3-b]furan-2(4H)-one (2)) skeleton. Critical positions for high binding affinity to the progesterone receptor were identified. (C) 1999 Elsevier Science Ltd. All rights reserved.
1,3-Disubstituted tetrabutyldistannoxanes catalyze acetilization of carbonyl compounds undermildconditions. Thorough investigations of factors influencing this reaction are given. A variety of synthetically useful carbonyl compounds are efficiently converted to acetals. In particular, acetilization of cyclic α,β-unsaturated ketones is readily achieved which have met with only limited success so far
Chemoselective ethylene acetalization of α, β-unsaturated vis-à-vis saturated carbonyl groups
作者:Theodore J. Nitz、Leo A. Paquette
DOI:10.1016/0040-4039(84)80004-0
日期:——
The difficulties which in the past have precluded controlled acetalization of an α,β-unsaturated ketone functionality in the presence of a saturatedcarbonylgroup can be overcome simply by making recourse to 2,4,6-collidinium p-toluenesulfonate as catalyst.