Oxidative cycloaddition of hydroxamic acids with dienes or guaiacols mediated by iodine(III) reagents
作者:Hisato Shimizu、Akira Yoshimura、Keiichi Noguchi、Victor N Nemykin、Viktor V Zhdankin、Akio Saito
DOI:10.3762/bjoc.14.39
日期:——
[Bis(trifluoroacetoxy)iodo]benzene (BTI) and (diacetoxyiodo)benzene (DIB) efficiently promote the formation of acylnitroso species from hydroxamic acids in the presence of various dienes to give the corresponding hetero-Diels-Alder (HDA) adducts in moderate to high yields. The present method could be applied to the HDA reactions of acylnitroso species with o-benzoquinones generated by the oxidative dearomatization
Rapid Cyclic Acetal and Cyclic Ketal Synthesis Assisted by a Rotary Evaporator
作者:Fuyao Jiang、Yinzhe Chen、Qian Zhang、Weiding Wang
DOI:10.1055/a-2293-3243
日期:2024.11
Herein, we present a rapid and efficient method for synthesizing cyclicacetals and ketals utilizing a rotary evaporator. Unlike the conventional Dean–Stark dehydration process, which typically demands extended reaction times and copious amounts of organic solvents, our approach affords the synthesis of cyclicacetals and ketals with varying ring sizes in 30 min while using minimal quantities of dimethyl