Two Approaches to Diverting the Course of a Free-Radical Cyclization: Application of Cyclopropylcarbinyl Radical Fragmentations and Allenes as Radical Acceptors
摘要:
Free radical cyclization of 4 and 7 gave the expected cyclization-reduction products (5 and 8) along with considerable amounts of products derived from a cyclization-atom transfer-secondary cyclization process (6 and 9). Two approaches to avoiding these unexpected products were explored. Use of a cyclopropylcarbinyl fragmentation avoided the secondary cyclization reaction (25 or 43 -> 26 or 44), whereas use of an allene as a radical acceptor avoided the atom-transfer reaction altogether (49 -> 52).
[EN] PD(II)-CATALYZED ENANTIOSELECTIVE C-H ARYLATION OF FREE CARBOXYLIC ACIDS<br/>[FR] ARYLATION C-H ÉNANTIOSÉLECTIVE CATALYSÉE PAR PD(II) D'ACIDES CARBOXYLIQUES LIBRES
申请人:SCRIPPS RESEARCH INST
公开号:WO2019204477A1
公开(公告)日:2019-10-24
The invention includes procedures for stereoselective β-arylation of carboxylic acids having a β-carbon atom. For example, stereoselective arylation procedures include the following reactions: (I)