In one aspect, the invention relates to compounds having the formula:
where R
1
, R
2
, R
3
, a, R
4
, R
5
, and R
6
are as defined in the specification, or a pharmaceutically acceptable salt thereof. These compounds have neprilysin inhibition activity. In another aspect, the invention relates to pharmaceutical compositions comprising such compounds; methods of using such compounds; and process and intermediates for preparing such compounds.
Asymmetric Construction of Bispiro‐Cyclopropane‐Pyrazolones via a [2+1] Cyclization Reaction by Dipeptide‐Based Phosphonium Salt Catalysis
作者:Dongming Lu、Xin Liu、Jia‐Hong Wu、Song Zhang、Jian‐Ping Tan、Xiaojun Yu、Tianli Wang
DOI:10.1002/adsc.202000073
日期:2020.5.12
We reported herein an efficient alternative for asymmetric synthesis of structurally complicated chiral bispiro‐cyclopropane‐pyrazolones via dipeptide‐based phosphonium salt catalyzed [2+1] cyclization of 2,3‐dioxopyrrolidines and halogenated pyrazolones. With this catalytic asymmetric protocol, a broad range of bispiro heterocyclic compounds bearing a pyrazolone unit were prepared in high yields with
Asymmetric Synthesis of Spiropyrazolones through Phosphine-Catalyzed [4+1] Annulation
作者:Xiaoyu Han、Weijun Yao、Tianli Wang、Yong Ren Tan、Ziyu Yan、Jacek Kwiatkowski、Yixin Lu
DOI:10.1002/anie.201311214
日期:2014.5.26
enantioselective synthesis of spiropyrazolones from allenoate‐derived MBH acetates and pyrazolones through a phosphine‐mediated [4+1] annulation process has been developed. Spiropyrazolones were readily prepared in good chemical yields and good to high enantioselectivities. This is the first asymmetric example in which α‐substituted allenoates were utilized as a C4 synthon for phosphine‐catalyzed [4+1] annulation
Bifunctional Phosphonium Salt‐catalyzed Enantioselective [4+2] Annulation of Isoindigos with Allenes: Access to Complex Heterocycles with Centerpiece of 4
<i>H</i>
‐Pyrans
作者:Juan Du、Jia‐Hong Wu、Lixiang Zhu、Xiaoyu Ren、Chunhui Jiang、Tianli Wang
DOI:10.1002/adsc.202000150
日期:2020.6.15
with promising biological activities, but have daunting synthetic challenges. Herein, we presented a regio‐ and stereoselective [4+2] annulation of isoindigo derivatives with allenes by bifunctional phosphonium catalysis. This protocol provides a complementary way for accessing complex heterocyclic compounds.