Reductive addition to electron-deficient olefins with trivalent iodine compounds
作者:Hideo Togo、Masahiko Aoki、Masataka Yokoyama
DOI:10.1016/s0040-4020(01)88042-x
日期:1993.9
(Diacyloxyiodo)arene was treated with electron-deficientolefins in the presence of hydrogen donor such as 1,4-cyclohexadiene to give the reductive addition products via alkyl radical through the radical decarboxylative pathway in good yields. Moreover, this system was able to generate either alkoxycarbonyl radicals or alkyl radicals with [bis(alkoxyoxalyloxy)iodo]benzene, which was prepared from alcohol
Hypoiodite reaction: the decomposition of oxalic acid half-esters
作者:K. Bartel、A. Goosen、A. Scheffer
DOI:10.1039/j39710003766
日期:——
Alkyl half-esters of oxalicacid photolysed with mercury(II) oxide–iodine reagent gave mainly dialkyl oxalates. 1-Apocamphyl hydrogen oxalate gave, in addition to the diester, 1-apocamphyl iodide. 9-Triptycyl hydrogen oxalate gave 9-triptycyl iodoformate, which was thermally decomposed to 9-iodotriptycene and with silver tetrafluoroborate gave 9-triptycyl fluoroformate. We suggest that diester formation
A mild and practical protocol for highly regioselective C6−Halkylation of purines with alcoholsintervened by oxalates under blue LED irradiation is reported. This transformation does not need transition metalcatalysts, is not sensitive to moisture and does not require N2 protection. Besides, this method displays broad functional groups compatibility and is easily scale up.
报告了一种温和实用的方案,用于在蓝色 LED 照射下草酸盐干预嘌呤与醇的高度区域选择性 C6-H 烷基化。这种转化不需要过渡金属催化剂,对水分不敏感,也不需要N 2保护。此外,该方法显示出广泛的功能组兼容性并且易于放大。
Photoinduced, Silver(I)-Mediated Synthesis of Ester-Substituted Fused Quinazolinones via Cascade Alkoxycarbonylation/Cyclization of Heterocycles Bearing Unactivated Alkenes
A new cascade alkoxycarbonylation/cyclization reaction of heterocycle-bearing unactivated alkenes is disclosed. The transformation is mediated by silver carbonate under photoirradiation. This method provides efficient access to pharmaceutically valuable molecules and natural product analogues containing quinazolinone-fused esters. Furthermore, this protocol is compatible with a variety of quinazolinone-bearing
photoredox-neutral 1,2,5-trifunctionalization of α-hydroxyhexenoates is disclosed. The reaction proceeds through a sequence of radical addition, intramolecular heteroaryl migration, and radical-polar crossover deuteration, leading to functionalized α-deuterated lactic acid derivatives. The reaction features mild photochemical conditions and provides an efficient approach for the synthesis of valuable deuterated