Facile synthesis of bromoallenes via N-bromosuccinimide/CH3SCH3 for the bromination of propargyl alcohols
作者:Wen Feng Jiang、Xue Song Liu、Xin Du、Jian Wei Wei、Chun Yu Bao
DOI:10.1016/j.cclet.2012.06.031
日期:2012.9
Abstract A novel and convenient way has been developed for the preparation of bromoallenes from propargyl alcohols by the reagent combination of N -bromosuccinimide and dimethyl sulfide. Bromoallenes with high regioselectivity were obtained in a convenient method.
Three component tandem reactions involving protected 2-amino indoles, disubstituted propargyl alcohols, and I2/ICl: iodo-reactant controlled synthesis of dihydro-α-carbolines and α-carbolines via iodo-cyclization/iodo-cycloelimination
作者:Sudhir K. Sharma、Sahaj Gupta、Mohammad Saifuddin、Anil K. Mandadapu、Piyush K. Agarwal、Harsh M. Gauniyal、Bijoy Kundu
DOI:10.1016/j.tetlet.2010.10.147
日期:2011.1
Two simple, highly efficient three component tandem reactions for the synthesis of diversified N-a N-b dicarbamate-4,9-dihydro-3-iodo-alpha-carbolines and N-a-carbamate-3-iodo-alpha-carbolines have been described. The strategy involves one-pot condensation of bis-carbamate protected 2-amino indoles with disubstituted propargyl alcohols and I-2/ICl. The salient feature of the reaction involves iodocyclo-elimination of N-b-linked carbamate under mild condition in the final step. (C) 2010 Elsevier Ltd. All rights reserved.
Highly enantioselective addition of linear alkyl alkynes to aromatic aldehydes
An asymmetric linear alkyl alkyne addition to aromatic aldehydes catalyzed by the Ti-(R)-BINOL system is reported with high enantioselectivity and yield. Our study expands upon the synthetic scope of propargylic alcohols, which could serve as potentially useful intermediates for the synthesis of various natural products. (C) 2011 Elsevier Ltd. All rights reserved.