An improved synthesis of the C,D-ring pyrromethenone of phytochrome and phytochromobilin
作者:Peter A Jacobi、Jiasheng Guo、Sheila I Hauck、Sam H Leung
DOI:10.1016/0040-4039(96)01317-2
日期:1996.8
Pyrromethenone 1b, the C,D-ring segment of both phytochrome (Pr) and phytochromobilin (PΦB) has been prepared in a highly efficient fashion beginning with 2-acetyl-butyrolactone (8). The key steps involved conversion of 8 to the Z-enol triflate 9, followed by Pdo catalyzed coupling with trimethylsilylacetylene, p-chlorophenylselenide ring opening, and amidation, to afford ring-D synthon 11 having the
Iterative Synthesis of Semicorrins, Tripyrrolines, and Higher Analogues
作者:Peter A. Jacobi、Hui Liu
DOI:10.1021/ja983698d
日期:1999.3.1
Toward the Synthesis of Biologically Important Chlorins, Isobacteriochlorins, and Corrins. Cyclic Enamides from Acetylenic Amides
作者:Peter A. Jacobi、Harry L. Brielmann、Sheila I. Hauck
DOI:10.1021/jo960428+
日期:1996.1.1
Cyclic enamides 1 of a type useful in the synthesis of naturally occurring chlorins, isobacteriochlorins, and corrins have been prepared by a process involving 5-exo-dig cyclization of the appropriate acetylenic amides 11. The desired cyclization is catalyzed by either n-Bu(4)NF or LiAl-(NHBn)(4).
Synthesis of 1,2,3,7,8,9-Hexahydrodipyrrins and Secocorrins: Important Precursors for the Construction of Corrins
作者:Peter A. Jacobi、Hui Liu
DOI:10.1021/ol990684j
日期:1999.7.1
[GRAPHICS]Hexahydrodipyrrins 15 (X = H-2) have been prepared by two routes: Pd(0)-initiated coupling/cyclization of triflates 11 and alkyne amines 12 and reduction of semicorrins 26 (X = 0).
Studies on Corrin Synthesis. A Solution to the Introduction of Meso Substituents