selectivities of Diels–Alderreactions of N-protected pyrroles with allene-1,3-dicarboxylates were studied under Lewis acid assisted and thermal reaction conditions. A novel attractive effect between the N-protective carbonyl group of pyrrole and the ester group of allene-1,3-dicarboxylates operates to control the selectivity in the above Diels–Alderreaction. This new attractive effect to give the
Synthesis of 1,3-dioxo-substituted allenes via copper(I)-catalyzed coupling of α-oxo-alkynes and α-oxo-diazos by controlling the sequence of adding substrates
作者:Chulong Liu、Yunxiang Weng、Xiaobao Zeng、Weiping Zheng、Xinyan Wang、Yuefei Hu
DOI:10.1016/j.tetlet.2019.01.015
日期:2019.2
A novel direct synthesis of 1,3-dioxo-substituted allenes was developed by copper(I)-catalyzed coupling of α-oxo-alkynes and α-oxo-diazos. It was a sequence of adding substrates-controlled method and the desired products were synthesized chemoselectively by adding α-oxo-alkyne terminally.
A brief and regiospecific synthesis of the late-stage intermediate to 11-deoxyanthracyclinones
作者:Y. Tamura、S. Akai、M. Sasho、Y. Kita
DOI:10.1016/s0040-4039(01)91551-5
日期:——
The late-stage intermediate (8) to 11-deoxyanthracyclinones has been prepared by a strongbaseinducedcycloaddition of 6-oxo-5,6,7,8-tetrahydrohomophthalic anhydride 1,2-ethanediyl acetal (9) to 3-bromojuglone methyl ether (10).
Anthracyclinone syntheses using strong base induced cycloaddition of homophthalic anhydrides and related compounds
作者:Yasumitsu Tamura、Manabu Sasho、Shuji Akai、Akimori Wada、Yasuyuki Kita
DOI:10.1016/s0040-4020(01)91513-3
日期:1984.1
The strong base induced cycloaddition of homophthalic anhydrides and relatedcompounds to halo- 1,4-naphthoquinone derivatives has been shown to provide short convergent syntheses of anthracyclinones, 4-demethoxydaunomycinone (1), daunomycinone (2), 11-deoxydaunomycinone (3), and 11-deoxycarminomycinone (4).
Thio-Michael addition of thioamides and allenes for the selective construction of polysubstituted 2-arylthiophenes <i>via</i> TBAI/H<sub>2</sub>O<sub>2</sub> promoted tandem oxidative annulation and 1,2-sulfur migration
作者:Teng Han、Xiaoyan Luo
DOI:10.1039/c8ob01835a
日期:——
addition/oxidativeannulation of allenes and thioamides for the construction of polysubstituted 2-arylthiophenes under a sulfur migration transformation protocol has been developed. The transition-metal-free protocol achieves the oxidative cyclization reaction of thioamides containing electron-rich substituents with allenes to construct polysubstituted thiophenes selectively by controlling oxidation conditions