Selective radical-chain epimerisation at CH centres α to oxygen under conditions of polarity-reversal catalysis
摘要:
Polarity-reversal catalysis by tri-tert-butoxysilanethiol has been applied to promote radical-chain epimerisation selectively at carbon centres of the type (RRC)-R-1-C-2*(H)OR. (C) 1999 Elsevier Science Ltd. All rights reserved.
Selective radical-chain epimerisation at CH centres α to oxygen under conditions of polarity-reversal catalysis
摘要:
Polarity-reversal catalysis by tri-tert-butoxysilanethiol has been applied to promote radical-chain epimerisation selectively at carbon centres of the type (RRC)-R-1-C-2*(H)OR. (C) 1999 Elsevier Science Ltd. All rights reserved.
Chiral and flexible 2,4-pentanediol-tethered cyclopropanation of olefins with a carbenoid derived from a diazo ester to construct three stereogenic centers
2,4-Pentanediol-tethered cyclopropanation of an olefin with an internal carbenoid generated from a diazo ester proceeded smoothly to give a chiral adduct having three stereogenic centers under full stereocontrol. The high stereoselectivity was not affected by the structure of the olefinic portion, studied so far with six substrates. Conversion of the product cyclopropane to other optically active compounds
CYCLOPENTYLPYRAZOLES AS N-TYPE CALCIUM CHANNEL BLOCKERS
申请人:Janssen Pharmaceutica NV
公开号:US20140051660A1
公开(公告)日:2014-02-20
Disclosed are compounds, compositions and methods for treating various diseases, syndromes, conditions and disorders, including pain. Such compounds are represented by Formula (I) as follows:
wherein R
1
, R
2
, R
3
, Q, and G are defined herein.