Asymmetric Synthesis of 2,3-Dihydro-2-arylquinazolin-4-ones: Methodology and Application to a Potent Fluorescent Tubulin Inhibitor with Anticancer Activity
摘要:
For several decades the 2,3-dihydroquinazolinone (DHQZ) heterocycle has been known to possess a variety of important biological and medicinal properties. Despite the many interesting facets of these molecules, synthetic access to nonracemic DHQZ analogues has remained elusive. Herein, we disclose a synthetic route that allows access to either enantiomer of a variety of DHQZ derivatives. We illustrate the utility of this chemistry with the asymmetric preparation and biological evaluation of a new chiral fluorescent tubulin binding agent with extremely potent antiproliferative properties against human cancer cells. A computational rationale for the increased potency of the (S)-enantiomer over the (R)-enantiomer is given, based on the crystal structure of alpha,beta-tubulin complexed with colchicine. Taking advantage of the inherent fluorescence of these molecules, confocal images of GMC-5-193 (compound 7) in the cytoplasm of human melanoma cells (MDA-MB-435) cells are presented.
Asymmetric Synthesis of 2,3-Dihydro-2-arylquinazolin-4-ones: Methodology and Application to a Potent Fluorescent Tubulin Inhibitor with Anticancer Activity
摘要:
For several decades the 2,3-dihydroquinazolinone (DHQZ) heterocycle has been known to possess a variety of important biological and medicinal properties. Despite the many interesting facets of these molecules, synthetic access to nonracemic DHQZ analogues has remained elusive. Herein, we disclose a synthetic route that allows access to either enantiomer of a variety of DHQZ derivatives. We illustrate the utility of this chemistry with the asymmetric preparation and biological evaluation of a new chiral fluorescent tubulin binding agent with extremely potent antiproliferative properties against human cancer cells. A computational rationale for the increased potency of the (S)-enantiomer over the (R)-enantiomer is given, based on the crystal structure of alpha,beta-tubulin complexed with colchicine. Taking advantage of the inherent fluorescence of these molecules, confocal images of GMC-5-193 (compound 7) in the cytoplasm of human melanoma cells (MDA-MB-435) cells are presented.
2-aminobenzamide and aldehydes, catalyzed by a novel chiral organocatalyst, was realized. The organocatalyst was found to be very effective and highly enantioselective for such cascade reactions at room temperature, affording 2,3-dihydroquinazolinones in excellent yields (up to 99%) with enantiomericexcesses of up to 97%. The best level of stereocontrol was obtained for aromatic/aliphatic aldehydes with ortho
Conformational Control of Organocatalyst in Strongly Brønsted‐Acidic Metal‐Organic Frameworks for Enantioselective Catalysis
作者:Hong Jiang、Xiangxiang Zhao、Wenqiang Zhang、Yan Liu、Haiyang Li、Yong Cui
DOI:10.1002/anie.202214748
日期:2023.1.9
(IDP) into two Dy metal-organic frameworks (MOFs) allows controlling the organocatalyst conformations and local chiral microenvironments. The MOF containing the 4-connected IDPs has a less compact shape and can be an efficient and recyclable heterogeneous Brønsted acid catalyst for the challenging asymmetric O,O-acetalization of diol and aldehyde with up to 96 % ee.
将手性 1,1'-双酚基亚氨基二磷酸 (IDP) 网状化为两个 Dy 金属有机框架 (MOF) 可以控制有机催化剂构象和局部手性微环境。包含 4-connected IDPs 的 MOF 具有不太紧凑的形状,可以作为一种高效且可回收的非均相 Brønsted 酸催化剂,用于具有挑战性的二醇和醛的不对称 O, O-缩醛化,ee 高达 96%。