The identification of substituted benzothiophene derivatives as PGE2 subtype 4 receptor antagonists: From acid to non-acid
摘要:
We disclose herein our preliminary SAR study on the identification of substituted benzothiophene derivatives as PGE(2) subtype 4 receptor antagonists. A potent EP4 antagonist 6a (K-i = 1.4 nM with 10% HSA) was identified. Furthermore, we found that an acidic group was not essential for the EP4 antagonizing activity in the series and neutral replacements were identified. This opens a new direction for future EP4 antagonist design. (C) 2010 Elsevier Ltd. All rights reserved.
To expand the toolbox for the synthesis of ortho-phenolic sulfilimines, sigmatropic rearrangements were introduced to the field of sulfiliminechemistry. Herein we report a N-H sulfenylation/[2,3]-sigmatropic rearrangement cascade reaction. This mild reaction enables commercially available thiols to serve as the sulfenylation reagent and generates water as the sole byproduct. Moreover, the reaction
Dual Directing-Groups-Assisted Redox-Neutral Annulation and Ring Opening of <i>N</i>-Aryloxyacetamides with 1-Alkynylcyclobutanols via Rhodium(III)-Catalyzed C–H/C–C Activations
A cascade [3 + 2] annulation and ringopening of N-aryloxyacetamides with 1-alkynylcyclobutanols via Rh(III)-catalyzed redox-neutral C–H/C–C activations using internal oxidative O–NHAc and −OH as the dual directing groups has been achieved. This reaction provided an efficient and regioselective approach to benzofuran derivatives with good functional group compatibility and high yields.
An internal oxidant-directing strategy enabling transition metal-free C–S bond ligation
作者:Yingying Zuo、Feng Xiong、Jing Zhao
DOI:10.1016/j.tet.2019.05.021
日期:2019.8
Organic sulfur compounds have broad applications in biology, medicine and material sciences and intensive efforts have been devoted to developing mild and general C-S bond-forming methods. However, a mild, transition-metal-free, direct C-H bond functionalization method remains elusive. Here, we report the use of an internal oxidant-directing strategy to achieve this goal. The cascade reactions described here show excellent chemoselectivity and a wide substrate scope for both oxyamines and sulfenylation reagents. This study enlarges the synthesis toolbox for preparing structurally diverse sulfilimines under mild conditions. (C) 2019 Elsevier Ltd. All rights reserved.