Total Synthesis and Preliminary Biological Evaluation of <i>cis</i>-Solamin Isomers
作者:Alex R. L. Cecil、Yulai Hu、María J. Vicent、Ruth Duncan、Richard C. D. Brown
DOI:10.1021/jo049909g
日期:2004.5.1
An efficient totalsynthesis of cis-solamin (1) has been achieved in 21% overall yield and with a longest linear sequence of just 11 steps from aldehyde 8. A key feature of the approach was the use of asymmetric permanganate-promoted oxidative cyclization to introduce four of the five required stereocenters in a single step. The use of robust and chemoselective methodology meant that the use of protecting
Concise stereoselective total synthesis of (+)-muricatacin and (+)<i>-epi-</i>muricatacin
作者:Hong-Bo Dong、Ming-Yan Yang、Bin Liu、Ming-An Wang
DOI:10.1080/10286020.2014.916695
日期:2014.8.3
Efficient stereoselective totalsynthesis of (+)-muricatacin (1) and (+)-epi-muricatacin (8) was accomplished from commercially available chemical pent-4-ynoic acid via Shi's asymmetric epoxidation and Mitsunobu reaction as the key steps in 17.8% and 26.9% overall yields, respectively.
Stereoselective synthesis of a versatile intermediate for the total synthesis of mono- and bis-THF containing annonaceous acetogenins
作者:Shyi-Tai Jan、Keqiang Li、Shikha Vig、Alexander Rudolph、Fatih M. Uckun
DOI:10.1016/s0040-4039(98)02222-9
日期:1999.1
stereogenic centers in 1 were established by Sharpless asymmetric epoxidation and Sharpless asymmetric dihydroxylation. Formation of the THF-ring unit was accomplished by acid catalyzed epoxide ring opening and 5-exocyclization reaction.
A convergent synthesis of two possible diastereomers of reticulatain-1 (1a and 1b) was accomplished. Comparison of the specific optical rotations of 1a and 1b did not allow for the strict determination of the absolute configuration. However, bis-(R)-MTPA esters of 1a and 1b showed a clear difference in chemical shifts in the 1H NMR spectra. If the bis-(R)-MTPA ester of natural reticulatain-1 (1) is
聚合合成了两种可能的reticulatain-1(1a和1b)非对映异构体。1a和1b的特定旋光度的比较不允许严格确定绝对配置。但是,1a和1b的双-(R)-MTPA酯在1 H NMR光谱中显示出明显的化学位移差异。如果天然网状甜菜碱-1(1)的bis-(R)-MTPA酯可用,则绝对构型为1将确定。用牛心脏线粒体复合物I检测了这些化合物的抑制作用。两种化合物显示出几乎相同的活性。
Oxidative polycyclization with rhenium(VII) oxides: application of the stereoselectivity rules in the total synthesis of rollidecins C and D
作者:Lawrence J. D'Souza、Santosh C. Sinha、Shou-Fu Lu、Ehud Keinan、Subhash C. Sinha
DOI:10.1016/s0040-4020(01)00381-7
日期:2001.6
route to the target compounds was guided by the recently proposed rules of stereoselectivity for the tandemoxidative cyclization reaction with trifluoroacetylperrhenate. Thus, the rapid transformation of compounds 14 and 15 to 1 and 2, respectively, was achieved with a predictable stereochemistry by the oxidative bis-cyclization with Re(VII) followed by one or two simple transformations.