Efficient Hydroxymethylation Reactions of Iodoarenes Using CO and 1,3-Dimethylimidazol-2-ylidene Borane
作者:Takuji Kawamoto、Takuma Okada、Dennis P. Curran、Ilhyong Ryu
DOI:10.1021/ol4006294
日期:2013.5.3
A hydroxymethylation reaction of a variety of iodoarenes proceeded effectively in the presence of CO, NHC-borane, diMeImd-BH3 (2) as a radical mediator, and a catalytic amount of AIBN. The reaction took place chemoselectively at the aryl-iodine bond but not at the aryl-bromine and aryl-chlorine bonds. A three-component couplingreaction comprising aryl iodides, CO, and electron-deficient alkenes also
Novel compound of formula I and pharmaceutically acceptable salts thereof are useful CNS agents: ##STR1## wherein X is CH or N; X' is CH or a direct covalent link; Y is CH, CH.sub.2 or N; Y' is N, NH, O or S; R.sup.1 is H, Br, Cl, F, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, C.sub.1-4 alkoxycarbonyl, CN, CONH.sub.2 or CH.sub.3 SO.sub.2 NH; n is 2 or 3; R.sup.2 is H or C.sub.1-4 alkyl; R.sup.3 is C.sub.1-4 alkoxy; R.sup.4 is H, Br, Cl, or F; and Z is CH or N.
The application of hypophosphite salts to solid-supported radical chemistry has been explored. EPHP-mediated intramolecular cyclisations have been shown to give good yield of cyclised products on JandaJel® resin.
A mass spectrometric investigation into microenvironmental effects in solid-supported radical chemistry
作者:Philip Andrew Helliwell、Victoria Adele Bailey、Caroline Chevet、Don Brian Clarke、Antony Lloyd、Roy Macarthur、Anne Routledge
DOI:10.1016/j.reactfunctpolym.2009.10.012
日期:2010.2
Deuterated N-ethylpiperidine hypophosphite (d-EPHP) and tributyltin deuteride (TBTD) have been used to explore potential microenvironmental effects in resin-bound radical propagation. A deuterium labelling mass spectrometric method was used to show that efficiency of radical chain propagation on resin can be influenced by the choice of solid-support when using the slow radical chain carrier, EPHP. (C) 2009 Elsevier Ltd. All rights reserved.