通过苯乙酮的sp 3 CH键与分子碘和二甲基亚砜(DMSO )的二杂芳基化反应,合成了一些新颖的对称双(吡咯并[2,3- d ]嘧啶基)甲烷。进一步,开发了一种有效的反应方案,通过该方案可以合成对称的和一些新的不对称的双(吡咯并[2,3- d ]嘧啶基)甲烷。为了这个目的,我们已经利用了1,3-二甲基巴比妥酸的高反应性和良好的离去性质。
Diastereoselective Synthesis of Spirobarbiturate-Cyclopropanes through Organobase-Mediated Spirocyclopropanation of Barbiturate-Based Olefins with Benzyl Chlorides
Abstract The organobase-mediated diastereoselective spirocyclopropanation of barbiturate-based olefins with 2,4-disubstituted benzyl chlorides has been developed. The reactions were carried out efficiently to afford the desired spirobarbiturate-cyclopropanes in up to 95% yield with more than 20:1 dr in favor of anti-isomers. In order to extend synthetic utility of the spiro-products, a Lewis acid induced
The invention relates to a compound of formula (I) or formula (II) or pharmaceutically acceptable salts, solvates, tautomers, stereoisomers or mixtures thereof; which are useful as medicaments, in particular as anti-proliferative agents and for use as a drug in an antibody-drug conjugate and in the treatment of proliferative diseases.
Regioselective synthesis of spirobarbiturate-dihydrofurans and dihydrofuro[2,3-d]pyrimidines via one-pot cascade reaction of barbiturate-based olefins and ethyl acetoacetate
作者:Songtao Liu、Pei Shao、Yanli Li、Donghao Wang、Deshan Hou、Chaofan Qu、Xixi Song、Xuebin Yan
DOI:10.1016/j.tet.2020.131859
日期:2021.1
Michael addition initiated ring closure reaction of barbiturate-base olefins and ethyl acetoacetate with NBS has been explored. Spirobarbiturate-dihydrofuans and dihydrofuro[2,3-d]pyrimidines were regioselectively synthesized via one-pot cascade reactions in the presence of DBU or potassium carbonate, respectively.
已经研究了迈克尔加成引发的巴比妥酸酯基烯烃和乙酰乙酸乙酯与NBS的闭环反应。螺旋巴比妥酸酯-二氢呋喃和二氢呋喃并[2,3- d ]嘧啶分别通过一锅级联反应在DBU或碳酸钾存在下区域选择性合成。
Chemoselective syntheses of spirodihydrofuryl and spirocyclopropyl barbiturates <i>via</i> cascade reactions of barbiturate-based olefins and acetylacetone
作者:Xuebin Yan、Pei Shao、Xixi Song、Chaofei Zhang、Chang Lu、Songtao Liu、Yanli Li
DOI:10.1039/c9ob00004f
日期:——
The Michael addition initiated ring closure reaction of barbiturate-based olefins and acetylacetone with NBS has been explored. The efficient and chemoselective approach for the synthesis of barbiturate-fused spirocycles was established. Spirodihydrofuryl barbiturates and spirocyclopropyl barbiturates were synthesized selectively via cascade reactions under different basic conditions in moderate to
Organocatalytic [3+2] Cycloadditions of Barbiturate-Based Olefins with 3-Isothiocyanato Oxindoles: Highly Diastereoselective and Enantioselective Synthesis of Dispirobarbiturates
Catalyzed by a Cinchona‐based thiourea, the [3+2] cycloadditions of barbiturate‐based olefins with 3‐isothiocyanatooxindoles proceeded readily, and furnished dispirobarbiturates in excellent chemical yields with excellent diastereo‐ and enantioselectivities. The absolute configuration of dispirobarbiturates was firmly confirmed by an X‐ray single crystal structure analysis. A reaction mechanism was