Enantiomerically Pure α-Amino Acid Synthesis via Hydroboration−Suzuki Cross-Coupling
作者:Philip N. Collier、Andrew D. Campbell、Ian Patel、Tony M. Raynham、Richard J. K. Taylor
DOI:10.1021/jo010865a
日期:2002.3.1
compound 25 undergo hydroboration with 9-BBN-H followed by palladium-catalyzedSuzukicoupling reactions with aryl and vinyl halides. After one-pot hydrolysis-oxidation, a range of known and novel nonproteinogenic amino acids were isolated as their N-protected derivatives. These novel organoborane homoalanine anion equivalents are generated and transformed under mild conditions and with wide functional
Facile conversion of chromane-6-triflate to chromane-6-alanines under palladium conditions
作者:Daniel K. Miller
DOI:10.1016/j.tetlet.2012.11.115
日期:2013.2
Conversion of chromane-6-triflate 5 to chromane-6-dehydroalanine 9 or 10 via its Bpin-derivative 6 followed by Suzuki coupling with protected dehydroalanine bromides 7 or 8 were reported (86%). Alternatively, a palladium-catalyzed stannation of 5 with Bu6Sn2 afforded the tributyltin derivative 11, and iodination (12) followed by coupling with 13 gave chromane-6-alanine 15 (75%). Either approach constitutes a conversion from chromane-6-triflate to the corresponding protected chromane-6-alanine or its dehydro analog. (C) 2012 Elsevier Ltd. All rights reserved.