Enantioselective synthesis of cyclopropane α-amino acids: Synthesis of N-Boc-cis-(2S,3R,4S)-3,4-methanoproline and N-Boc-(2S,3R,4S)-3,4-methanoglutamic acid
摘要:
The tide compounds were synthesized by a S-step facile transformation of the key intermediate 4, itself obtained by a ''one-pot'' sulfone-mediated cyclopropanation from chiral synthon (R)-I and (2R)-glycidyl triflate.
A novel method for chirospecific synthesis of 2,5-disubstituted pyrrolidines
作者:N. André Sasaki、Isabelle Sagnard
DOI:10.1016/s0040-4020(01)85236-4
日期:1994.1
One-pot ring formation using (R)-1 or (S)-1 as a nucleophile and homochiral glycidyl triflate (R)-2 or (S)-2 as an electrophile a pivotal intermediate 4 which can be transformed into a 2,5-disubstituted pyrrolidine with any desired stereochemistry at the C-2 and C-5 positions.
Phase-transfer-catalyzed Asymmetric Alkylation with Epoxy Triflates as Alkylating Agents: Highly Stereoselective Synthesis of γ,δ-Epoxy-α-amino Acids
作者:Satoru Arimitsu、Daisuke Kato、Keiji Maruoka
DOI:10.1246/cl.2011.1115
日期:2011.10.5
Although alkyl sulfonates are commonly used for alkylating agents, there are very few reports on phase-transfer-catalyzed asymmetric alkylation with alkyl sulfonates. Herein, we report that the asy...
Synthesis of Stereochemically and Skeletally Diverse Fused Ring Systems from Functionalized<i>C</i>-Glycosides
作者:Baudouin Gerard、Maurice D. Lee、Sivaraman Dandapani、Jeremy R. Duvall、Mark E. Fitzgerald、Sarathy Kesavan、Jason T. Lowe、Jean-Charles Marié、Bhaumik A. Pandya、Byung-Chul Suh、Morgan Welzel O’Shea、Michael Dombrowski、Diane Hamann、Berenice Lemercier、Tiffanie Murillo、Lakshmi B. Akella、Michael A. Foley、Lisa A. Marcaurelle
DOI:10.1021/jo4000916
日期:2013.6.7
A diversity-oriented synthesis (DOS) strategy was developed for the synthesis of stereochemically diverse fused-ring systems containing a pyran moiety. Each scaffold contains an amine and methyl ester for further diversification via amine capping and amide coupling. Scaffold diversity was evaluated in comparison to previously prepared scaffolds by a shape-based principal moments of inertia (PMI) analysis
Design of Bifunctional Antibiotics that Target Bacterial rRNA and Inhibit Resistance-Causing Enzymes
作者:Steven J. Sucheck、Andrew L. Wong、Kathryn M. Koeller、David D. Boehr、Kari-ann Draker、Pamela Sears、Gerard D. Wright、Chi-Huey Wong
DOI:10.1021/ja000575w
日期:2000.5.1
Asymmetric syntheses of all four stereoisomers of 2,3-methanomethionine
作者:Kevin Burgess、Kwok Kan Ho
DOI:10.1021/jo00048a028
日期:1992.10
Asymmetric syntheses of all four stereoisomers of 2,3-methanomethionine ((Z)- and (E)-cyclo-Met) are described. The source of chirality in these reactions is the trifluoromethylsulfonate ester 1b which reacts with di-tert-butyl malonate via direct displacement of trifluoromethylsulfonate followed by lactonization to give 1-(tert-butoxycarbonyl)-2-oxo-3-oxabicyclo[3.1.0]hexane (2). Conversion of compound 2 into (Z)-cyclo-Met can be achieved via ring opening of the lactone, Hoffmann rearrangement, mesylation, and displacement with thiomethoxide. A route to (E)-cyclo-Met was developed using a lipase to effect a critical ester hydrolysis.