Stereoselective synthesis of 10,11-dihydro-leukotriene B4 and related metabolites
作者:Yuichi Kobayashi、Yuji Nakayama、G. Biju Kumar
DOI:10.1016/s0040-4039(98)01346-x
日期:1998.8
Nickel-catalyzed coupling reaction of cis bromide 6 and the berates 5a and 5b, prepared from the boronate esters 4a and 4b, proceeded stereospecifically to furnish 7a and 7b, which upon treatment with Bu4NF in THF afforded 10,11-dihydro-leukotriene B-4 (1) and the B-3 (2), respectively. In a similar way, EE ether 19 and rac-4a gave 20 and the subsequent functional group transformation afforded 10,11-dihydro-12-oxo-LTB4 (3). (C) 1998 Elsevier Science Ltd. All rights reserved.
YADAGIRI, PENDRI;LUMIN, SUN;FALCK, J. R.;KARARA, ARMANDO;CAPDEVLLA, JORGE, TETRAHEDRON LETT., 30,(1989) N 4, C. 429-432
作者:YADAGIRI, PENDRI、LUMIN, SUN、FALCK, J. R.、KARARA, ARMANDO、CAPDEVLLA, JORGE
DOI:——
日期:——
Total synthesis of 5(S),12(S)- and 5(S),12(R)-dihydroxyeicosa-6(Z),8(E),14(Z)-trienoic acids, metabolites of leukotriene B4
The recently identified dihydro-leukotriene B4 metabolite and its C(12)-epi analogue were prepared by Wittig coupling of segments derived from 2-deoxy--ribose and -glutamic acid.
Synthesis of 10,11-Dihydroleukotriene B<sub>4</sub> Metabolites via a Nickel-Catalyzed Coupling Reaction of <i>cis</i>-Bromides and <i>trans</i>-Alkenyl Borates
作者:Yuji Nakayama、G. Biju Kumar、Yuichi Kobayashi
DOI:10.1021/jo9913199
日期:2000.2.1
corresponding diethyl boronates, which upon ligand exchange with Me(2)C(CH(2)OH)(2) furnished boronate esters 11a and 11b in 75% and 77% yields, respectively. In a similar manner, racemic boronate ester rac-11a, an intermediate for synthesis of 5, was prepared from racemic epichlorohydrin. For synthesis of 2, borate 25 was generated from 11a (1.5 equiv) and MeLi (1.6 equiv). Without isolation, 25 was submitted