order to realize high birefringence, acetylenes with long molecular size such as bis(phenyldiynyl)benzenes 1 and diphenylhexatriynes 4 are synthesized successfully on the basis of double elimination of the β-substituted sulfones which can be prepared easily by reaction of benzyl or propargyl sulfones with propynal derivatives.
A simple and efficient method for mild and selective oxidation of propargylic alcohols using TEMPO and calcium hypochlorite
作者:Sabbasani Rajasekhara Reddy、Anju Chadha
DOI:10.1039/c3ra41721b
日期:——
Oxidation of propargylic alcohols to the corresponding aldehydes and ketones was achieved at room temperature using 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and calcium hypochlorite (Ca(OCl)2). Propargylic diols yielded corresponding dialdehydes as the product. This system was found to be very efficient for both the electron donating and electron withdrawing groups such as methoxy and nitro substituted
Iodo- and Chalcogenoannulation of Morita–Baylis–Hillman Alcohols of Propiolaldehydes: Entry to Functionalized 2-Pyrones
作者:Chada Raji Reddy、Amol D. Patil
DOI:10.1021/acs.orglett.1c01466
日期:2021.6.18
presence of ICl or PhSeSePh/PhSSPh–CuCl2. This cyclization offers access to a wide variety of iodinated or chalcogenated 3-(chloromethyl)-2-pyrones in good yields. The chloromethyl group of the obtained 2-pyrones has been easily converted to introduce other handy functionalities, which allowed for further transformations to synthesize diverse 2-pyrone containing molecules.