作者:K. C. Nicolaou、Lei Shi、Min Lu、Manas R. Pattanayak、Akshay A. Shah、Heraklidia A. Ioannidou、Manjunath Lamani
DOI:10.1002/anie.201406815
日期:2014.10.6
The totalsynthesis of cytotoxic polyketides myceliothermophins E (1), C (2), and D (3) through a cascade‐based cyclization to form the trans‐fused decalin system is described. The convergent synthesis delivered all three natural products through late‐stage divergence and facilitated unambiguous C21 structural assignments for 2 and 3 through X‐ray crystallographic analysis, which revealed an interesting
描述了细胞毒性聚酮类菌丝体热蛋白 E ( 1 )、C ( 2 ) 和 D ( 3 ) 通过级联环化的全合成,以形成输血的十氢化萘系统。会聚合成通过后期发散提供了所有三种天然产物,并通过 X 射线晶体学分析促进了2和3 的明确 C21 结构分配,这揭示了其对映体形式之间有趣的二聚体结构。
Total Synthesis of Divergolides E and H
作者:Scott M. Caplan、Paul E. Floreancig
DOI:10.1002/anie.201810336
日期:2018.11.26
This manuscript describes the first total syntheses of divergolides E and H. The route employs a telescoped hetero‐Diels–Alder and oxidative carbon–hydrogen bond cleavage as an entry into the central bridged bicyclic acetal unit. Additional key steps of the highly convergent route include a desymmetrizing epoxidation, a chelation‐controlled alkenylzinc addition, an amide formation between a hindered
The Chemistry of 2<i>H</i>-3,1-Benzoxazine-2,4(1<i>H</i>)-dione (Isatoic Anhydride). 20<sup>1</sup>. Synthesis and Wittig Reactions of Dimethyl (4-Oxo-1,4-dihydro-Quinolin-2-yl)methanephosphonates
作者:Gary M. Coppola
DOI:10.1055/s-1988-27474
日期:——
Isatoic anhydrides react with dilithiated 2-oxoalkanephosphonates to give dimethyl (4-oxo-1,4-dihydroquinolin-2-yl)methanephosphonates 5. These phosphonates undergo a Horner reaction with aldehydes to produce 2-(1-alkenyl)-4(1H)- quinolinones 10 in good yields.
Thionium Ion Initiated Medium-Sized Ring Formation: The Total Synthesis of Asteriscunolide D
作者:Barry M. Trost、Aaron C. Burns、Mark J. Bartlett、Thomas Tautz、Andrew H. Weiss
DOI:10.1021/ja210986f
日期:2012.1.25
product asteriscunolide D has been accomplished in nine steps without the use of protecting groups. The challenging 11-membered ring was forged via a diastereoselective thionium ion initiated cyclization, which constitutes a formal aldol disconnection to form a strained macrocycle. A stereospecific thioether activation-elimination protocol was developed for selective E-olefin formation, thus providing access
Extending the Scope of a Known Furan Synthesis - A Novel Route to 1,2,4-Trisubstituted Pyrroles
作者:Marko Friedrich、Andreas Wächtler、Armin de Meijere
DOI:10.1055/s-2002-22707
日期:——
2-(Acylmethylene)propanediol diacetates, which cyclize readily under acidic conditions to give furans (76-84%) react with primary amines under palladium catalysis to give 1,2,4-trisubstituted pyrroles in moderate to good yields (39-53%). When glycine methyl ester is used as the amine, substituted methyl pyrrol-1-ylacetates (31-82%) are obtained.