Enantiomerically pure α-methoxyaryl acetaldehydes as versatile precursors: a facile chemo-enzymatic methodology for their preparation
摘要:
A facile and efficient synthesis of optically active alpha-methoxyaryl acetic acids (up to 95% ee), alpha-methoxyaryl ethanols (up to 93% ee) and alpha-methoxyaryl acetonitriles (up to 93% ee) was achieved via Arthrobacter sp. lipase-catalyzed kinetic resolution of masked aldehydes as the key synthons, that is, alpha-hydroxyaryl acetaldehyde acetals. (C) 2008 Elsevier Ltd. All rights reserved.
intramolecular trapping of the aminoenol intermediate derived from o-acyl/formylanilines and α-hydroxydimethylacetals/ketals followed by rearrangement/aromatization in the presence of acid. Important features include the use of α-hydroxydimethylacetal/ketal as an α-hydroxycarbonyl equivalent, excellent regiocontrol, good functional group tolerance, selectivesynthesis of acylindoles, gram-scale synthesis, and
(Dialkoxymethyl)lithiums: generation, stability, and synthetic transformations
作者:Christopher S. Shiner、Tetsuto Tsunoda、Burton A. Goodman、Stephen Ingham、Shi Hung Lee、Paul E. Vorndam
DOI:10.1021/ja00186a036
日期:1989.2
SHINER, CHRISTOPHER S.;TSUNODA, TETSUTO;GOODMAN, BURTON A.;INGHAM, STEPHE+, J. AMER. CHEM. SOC., 111,(1989) N, C. 1381-1392
作者:SHINER, CHRISTOPHER S.、TSUNODA, TETSUTO、GOODMAN, BURTON A.、INGHAM, STEPHE+
DOI:——
日期:——
Enantiomerically pure α-methoxyaryl acetaldehydes as versatile precursors: a facile chemo-enzymatic methodology for their preparation
作者:Buddh Singh、Pankaj Gupta、Asha Chaubey、Rajinder Parshad、Shiromani Sharma、Subhash C. Taneja
DOI:10.1016/j.tetasy.2008.10.023
日期:2008.11
A facile and efficient synthesis of optically active alpha-methoxyaryl acetic acids (up to 95% ee), alpha-methoxyaryl ethanols (up to 93% ee) and alpha-methoxyaryl acetonitriles (up to 93% ee) was achieved via Arthrobacter sp. lipase-catalyzed kinetic resolution of masked aldehydes as the key synthons, that is, alpha-hydroxyaryl acetaldehyde acetals. (C) 2008 Elsevier Ltd. All rights reserved.
An interrupted Heyns rearrangement approach for the regioselective synthesis of acylindoles
作者:Minakshi Altia、Pazhamalai Anbarasan
DOI:10.1039/d3cc04144a
日期:——
An efficient and general method for the synthesis of 2- and 3-acylindoles has been achieved with high regioselectivity from o-acylanilines and α-hydroxycarbonyl or its equivalent. The strategy involves the intramolecular trapping of an in situ generated aminoenol intermediate and an interrupted Heyns rearrangement pathway, followed by aromatization or rearrangement/aromatization. Important features