78926-09-7Relevant articles and documents
Visible-Light-Induced [4+2] Annulation of Thiophenes and Alkynes to Construct Benzene Rings
Song, Chunlan,Dong, Xin,Wang, Zhongjie,Liu, Kun,Chiang, Chien-Wei,Lei, Aiwen
supporting information, p. 12206 - 12210 (2019/07/31)
The [4+2] annulation represents an elegant and versatile synthetic protocol for the construction of benzene rings. Herein, a strategy for visible-light induced [4+2] annulation of thiophenes and alkynes, to afford benzene rings, is presented. Under simple and mild reaction conditions, the ready availability and structural diversity of thiophenes and alkynes permit the facile synthesis of several substituted aromatic rings. Valuable drugs and amino acids are also well tolerated. Moreover, DFT calculations explain the high regioselectivity of the reaction.
Gold(I)-phosphine catalyst for the highly chemoselective dehydrogenative silylation of alcohols
Ito, Hajime,Takagi, Katsuhiro,Miyahara, Takahiro,Sawamura, Masaya
, p. 3001 - 3004 (2007/10/03)
(Chemical Equation Presented) A gold(I) complex of Xantphos AuCl(xantphos) catalyzes the dehydrogenative silylation of alcohols with high chemoselectivity and solvent tolerance. It is selective for the silylation of hydroxyl groups in the presence of alke
Effective silylation of carboxylic acids under solvent-free conditions with tert-butyldimethylsilyl chloride (TBDMSCL) and triisopropylsilyl chloride (TIPSCL)
Firouzabadi, Habib,Iranpoor, Naser,Shaterian, Hamid Reza
, p. 71 - 81 (2007/10/03)
Varions types of carboxylic acids can be converted effectively to their corresponding TBDMS and TIPS esters using TBDMSCI and TIPSCI in the presence of imidazole under solvent-free conditions. The advantage of this modified method in comparison with that reported by Corey is the elimination of DMF, which eliminates aqueous work-up. The method is not a time-consuming process and the reactions proceed spontaneously. By this method, absolute chemoselectivity for the protection of carboxylic acid functions in the presence of 2°, 3° hydroxyl groups are observed.