Total synthesis of (±)-sacidumlignans D and A through Ueno–Stork radical cyclization reaction
作者:Jian-Jian Zhang、Chang-Song Yan、Yu Peng、Zhen-Biao Luo、Xiao-Bo Xu、Ya-Wen Wang
DOI:10.1039/c3ob00053b
日期:——
Efficient synthesis of (±)-sacidumlignan D (4) has been successfully achieved employing Ueno–Stork radicalcyclization of α-bromo acetal 21 as a key step. Two synthetic approaches for the symmetrical diaryl ketone 19 have been discussed in detail. Notably, sacidumlignan A (1) can be also efficiently synthesized in only 7 steps with 25% overall yield, where acid triggered tandem reaction starting from
Copper(I)-Catalyzed Stereo- and Chemoselective Borylative Radical Cyclization of Alkyl Halides Bearing an Alkene Moiety
作者:Hiroaki Iwamoto、Sota Akiyama、Keiichi Hayama、Hajime Ito
DOI:10.1021/acs.orglett.7b00940
日期:2017.5.19
The stereoselective borylative radical cyclization of alkyl halides containing an alkene moiety was developed using a copper(I)/diboron catalyst system. The optimized reaction conditions allowed us to control the chemoselectivity between the allylic substitution and the borylative radical cyclization. The borylation products were subsequently converted to highly functionalized organic compounds by
1-Substituted-1-oxo-prostane-derivatives of the E, A and F series
申请人:American Cyanamid Company
公开号:US04297516A1
公开(公告)日:1981-10-27
The invention disclosed herein relates to pharmacologically active prostaglandin derivatives of the E, F, or A series having on the terminal methylene carbon of the alpha chain, a substituent selected from the group consisting of: ##STR1## wherein R is C.sub.1 to C.sub.6 alkyl, and phenyl or phenyl substituted with one or more substituents selected from the group consisting of C.sub.1 -C.sub.4 alkyl, OR.sub.16, SR.sub.16, F, or Cl, and R.sub.16 is C.sub.1 to C.sub.6 alkyl.
Rapid Synthesis of an Advanced Functionalized Monocyclofarnesyl Intermediate Using 1,2-Dibromoethyl Ethyl Ether as a Bromoacetaldehyde Equivalent in the Synthesis of Furan-2(5H)-ones
作者:F. W. Joachim Demnitz、Ralph A. Raphael
DOI:10.1055/s-1996-4378
日期:1996.11
The lithium enolate of the â-lactone 10 was reacted with 1,2-dibromoethyl ethyl ether to furnish 12, treatment of which with aqueous K2CO3 gave a highly functionalized sesquiterpene of the monocyclofarnesyl skeleton the 3-substituted furan-2(5H)-one 13a.
作者:Joyce C. Leung、Aaron A. Bedermann、Jón T. Njardarson、David A. Spiegel、Graham K. Murphy、Naoto Hama、Barry M. Twenter、Ping Dong、Tatsuya Shirahata、Ivar M. McDonald、Munenori Inoue、Nobuaki Taniguchi、Travis C. McMahon、Christopher M. Schneider、Nancy Tao、Brian M. Stoltz、John L. Wood
DOI:10.1002/anie.201712369
日期:2018.2.12
Described herein is a synthetic strategy for the total synthesis of (±)‐phomoidride D. This highly efficient and stereoselective approach provides rapid assembly of the carbocyclic core by way of a tandem phenolic oxidation/intramolecular Diels–Alder cycloaddition. A subsequent SmI2‐mediated cyclization cascade delivers an isotwistane intermediate poised for a Wharton fragmentation that unveils the