在Li +存在下和在水存在或不存在PTC的情况下,进行酮和醛的反应以生成醛醇产物。已经证明了水性反应相对于有机溶剂介导的反应的几个优点,包括更高的产率,更短的反应时间,更简单的纯化以及更好的官能团耐受性。在水中已经实现了一些在有机溶剂中不发生的反应。成功归因于相邻的杂原子效应。在水性羟醛缩合中,Li 2 CO 3硫醇是一种有效的催化剂,因此可与碱结合的基团(例如环氧化物,酯和甲硅烷基)可以幸免。对于杂芳族乙酮,在没有PTC的情况下完成了水性醛醇缩合反应,以良好的收率得到了β-羟基酮。水介导的醛基半缩醛与芳香族酮的缩合导致定量产率的新的碳水化合物衍生骨架。在某种程度上,这项研究扩大了醛醇缩合和反应的适用性。
Design, synthesis and biological evaluation of novel steroidal spiro-oxindoles as potent antiproliferative agents
作者:Bin Yu、Xiao-Jing Shi、Ping-Ping Qi、De-Quan Yu、Hong-Min Liu
DOI:10.1016/j.jsbmb.2014.01.015
日期:2014.5
Two series of novel steroidal spiro-pyrrolidinyl oxindoles 3a-t and 6a-c were designed and synthesized from dehydroepiandrosterone using the 1,3-dipolar cycloaddition as the key step and further evaluated for their antiproliferative activities for four human cancer cell lines (MGC-803, EC109, SMMC-7721 and MCF-7). This protocol achieved the formation of two C-C bonds, one C-N bond and the creation of one new five-membered pyrrolidine ring and three contiguous stereocenters in a single operation. Biological evaluation showed that these synthesized steroidal spiro-pyrrolidinyl oxindoles possessed moderate to good antiproliferative activities against the tested cell lines and some of them were more potent than 5-Fu. Particularly, compound 3g showed good antiproliferative activity against SMMC-7721 (IC50= 0.71 mu M). Steroid dimer 6b showed improved antiproliferative activities against SMMC-7721 and MCF-7 with the IC50 values of 4.30 and 2.06 mu M, respectively. Flow cytometry analysis demonstrated that compound 3n caused the cellular early apoptosis and cell cycle arrest at G2/M phase in a concentration- and time-independent manner. (C) 2014 Elsevier Ltd. All rights reserved.
Neighboring Heteroatom Effect Unique to Aqueous Aldol Reactions of Water-Insoluble Substrates
作者:Bo Li、Chunbao Li
DOI:10.1021/jo500213b
日期:2014.3.7
In the aqueous aldol condensations, Li2CO3 was an efficient catalyst, and therefore base-liable groups such as epoxides, esters, and silyl groups could survive. For heteroaromatic ethanones, the aqueous aldol reactions were accomplished without PTC to give β-hydroxyketones in good yields. The water-mediated condensations of aldosyl hemiacetals with aromatic ketones led to a new carbohydrate-derived
在Li +存在下和在水存在或不存在PTC的情况下,进行酮和醛的反应以生成醛醇产物。已经证明了水性反应相对于有机溶剂介导的反应的几个优点,包括更高的产率,更短的反应时间,更简单的纯化以及更好的官能团耐受性。在水中已经实现了一些在有机溶剂中不发生的反应。成功归因于相邻的杂原子效应。在水性羟醛缩合中,Li 2 CO 3硫醇是一种有效的催化剂,因此可与碱结合的基团(例如环氧化物,酯和甲硅烷基)可以幸免。对于杂芳族乙酮,在没有PTC的情况下完成了水性醛醇缩合反应,以良好的收率得到了β-羟基酮。水介导的醛基半缩醛与芳香族酮的缩合导致定量产率的新的碳水化合物衍生骨架。在某种程度上,这项研究扩大了醛醇缩合和反应的适用性。
Dubey, Sonal; Jindal, Dharam Paul; Piplani, Poonam, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2005, vol. 44, # 10, p. 2126 - 2137