Preparation and biological activity of 13-substituted retinoic acids
摘要:
13-Demethyl or 13-substituted all-E- and 9Z-retinoic acids were synthesized using a palladium-catalyzed coupling reaction of enol triflates and tributylstannylolefins. Their biological activities were then measured. The 13-ethyl analogs exhibited approximately one-half of the antiproliferative and differentiation-inducing activity of ATRA in HL-60 cells. In contrast, in the 9Z-derivatives, all analogs, except for the 13-butyl derivatives, showed apoptosis-inducing activity. (C) 2004 Elsevier Ltd. All rights reserved.
STERO CONTROLLED SYNTHESIS OF (E,Z)-DIENALS VIA TANDEM RH(I) CATALYZED PROPARGYL CLAISEN REARRANGEMENT
申请人:The Florida State University Research Foundation, Inc.
公开号:US20150361019A1
公开(公告)日:2015-12-17
A novel Rh(I)-catalyzed approach to synthesizing functionalized (E,Z) dienal compounds has been developed via tandem transformation where a stereoselective hydrogen transfer follows a propargyl Claisen rearrangement. Z-Stereochemistry of the first double bond suggests the involvement of a six-membered cyclic intermediate whereas the E-stereochemistry of the second double bond stems from the subsequent protodemetallation step giving an (E,Z)-dienal. The reaction may be represented by the following sequence.
METHODS FOR ENHANCING HEMATOPOIETIC STEM/PROGENITOR CELL ENGRAFTMENT
申请人:CHILDREN'S MEDICAL CENTER CORPORATION
公开号:US20150246075A1
公开(公告)日:2015-09-03
Described herein are methods for enhancing engraftment of hematopoietic stem and progenitor cells using compounds identified using a zebrafish model of hematopoietic cell engraftment. The compounds can be used to treat hematopoietic stem cells ex vivo prior to transplantation of the cells. Alternatively, the compounds can be administered to an individual undergoing cell transplantation.
STEREO CONTROLLED SYNTHESIS OF (E,Z)-DIENALS VIA TANDEM RH(I) CATALYZED PROPARGYL CLAISEN REARRANGEMENT
申请人:The Florida State University Research Foundation, Inc.
公开号:US20170129865A1
公开(公告)日:2017-05-11
A novel Rh(I)-catalyzed approach to synthesizing functionalized (E,Z) dienal compounds has been developed via tandem transformation where a stereoselective hydrogen transfer follows a propargyl Claisen rearrangement. Z-Stereochemistry of the first double bond suggests the involvement of a six-membered cyclic intermediate whereas the E-stereochemistry of the second double bond stems from the subsequent protodemetallation step giving an (E,Z)-dienal. The reaction may be represented by the following sequence.