The disclosure provides biocatalysts that halogenate complex chemical compounds in specific and predictable ways. Also disclosed are halogenated complex organic compounds. The disclosure further provides methods for the halogenation of complex chemical compounds and methods of inhibiting the contraction of smooth muscle in mammals.
Enantioselective Synthesis of (+)-Malbrancheamide B
作者:Stephen W. Laws、Jonathan R. Scheerer
DOI:10.1021/jo3026059
日期:2013.3.15
The asymmetric total synthesis of the chlorinated [2.2.2]-diazabicyclic indole alkaloid (+)-malbrancheamide B is reported. Key to the synthesis is a domino reaction sequence that employs an aldol condensation, alkene isomerization, and intramolecular Diels-Alder cycloaddition. Diastereofacial selection between the azadiene stereofaces is enforced with a chiral aminal auxiliary. A formal 7-step (longest linear route) synthesis of (+/-)-malbrancheamide B is also reported.
Function and Structure of MalA/MalA′, Iterative Halogenases for Late-Stage C–H Functionalization of Indole Alkaloids
作者:Amy E. Fraley、Marc Garcia-Borràs、Ashootosh Tripathi、Dheeraj Khare、Eduardo V. Mercado-Marin、Hong Tran、Qingyun Dan、Gabrielle P. Webb、Katharine R. Watts、Phillip Crews、Richmond Sarpong、Robert M. Williams、Janet L. Smith、K. N. Houk、David H. Sherman
DOI:10.1021/jacs.7b06773
日期:2017.8.30
biological activity. In this study, we characterized the two flavin-dependenthalogenases involved in the late-stage halogenation of malbrancheamide in two different fungal strains. MalA and MalA′ catalyze the iterative dichlorination and monobromination of the free substrate premalbrancheamide as the final steps in the malbrancheamide biosynthetic pathway. Two unnatural bromo-chloro-malbrancheamide analogues
A unified strategy to reverse-prenylated indole alkaloids: total syntheses of preparaherquamide, premalbrancheamide, and (+)-VM-55599
作者:Jose B. Roque、Eduardo V. Mercado-Marin、Sven C. Richter、Danilo Pereira de Sant'Ana、Ken Mukai、Yingda Ye、Richmond Sarpong
DOI:10.1039/d0sc02296a
日期:——
constructed through a one-pot Hofmann rearrangement followed by Fischer indole synthesis. The utilization of our previously reported indole peripheral functionalization strategy also led to natural products including malbrancheamides B, C, stephacidin A, notoamides F, I and R, aspergamide B, and waikialoid A. Ultimately, the divergent route that we devised provided access to a wide range of prenylated