Carbon–Sulfur Bond Formation: Tandem Process for the Synthesis of Functionalized Isothiazoles
作者:Rui Li、Kai Wei、Wen Chen、Liang Li、Hongbin Zhang
DOI:10.1021/acs.orglett.1c03994
日期:2022.1.14
this paper, we report a new process for the construction of 3,4,5-substituted isothiazoles via reaction cascades including Pummerer-like rearrangement, nucleophilic condensation, and sulfenamide cyclization followed by concomitant elimination and dehydration under mild reaction conditions. This process provides isothiazoles bearing fluorine and other functional groups in good to excellent yields from
Highly efficient asymmetric construction of novel indolines and tetrahydroquinoline derivatives <i>via</i> aza-Barbier/C–N coupling reaction
作者:Tao Guo、Bin-Hua Yuan、Wen-Jie Liu
DOI:10.1039/c7ob02891a
日期:——
Highly stereoselectivesyntheses of chiral indolines and tetrahydroquinolines are achieved by combining the asymmetric Zn-mediated allylation of chiral N-tert-butanesulfinyl imines with efficient intramolecular C–N cross-coupling. Herein, the advantages of such a synthetic strategy are illustrated by the synthesis of indolines and tetrahydroquinolines with quaternary stereocenters and multi-substituted
Herein, we report a new process for the synthesis of highlyfunctionalizedpyridines based on a tandem Pummerer-type rearrangement, aza-Prins cyclization, and elimination-induced aromatization. This formal [5+1] cyclization provides pyridines in good yields with easily accessible starting materials. The synthetic potential of our new method is further demonstrated in the modification of the frameworks
<i>Z</i>-Stereoselective Aza-Peterson Olefinations with Bis(trimethylsilane) Reagents and Sulfinyl Imines
作者:Manas Das、Donal F. O’Shea
DOI:10.1021/acs.orglett.5b03519
日期:2016.1.15
Highlystereoselective aza-Peterson olefinations from bench-stable α,α-bis(trimethylsilyl)toluene reagents and N-substituted imines have been achieved using TMSO–/Bu4N+ as Lewis base activator in THF. Remarkably, and for the first time, N-t-butanesulfinyl imines were utilized for the synthesis of Z-stilbenes with excellent selectivities, while N-aryl imines generated E-stilbenes under identical reaction
novel approach to skipped dienes has been developed through the TMSOTf-mediated one-pot addition–substitution of olefins 2a, 2f and 2g with imines 1a–1g, and a series of aryl substituted skipped dienes 3aa–3gf were accordingly obtained in 62%–94% yields. Moreover, semicyclic N,O-acetals 5 and 7 could also undergo this transformation to produce the corresponding skipped dienes 6aa and 6af–6al and 8ba