108341-87-3Relevant academic research and scientific papers
Convergent total synthesis of (+)-mycalamide A
Kagawa, Natsuko,Ihara, Masataka,Toyota, Masahiro
, p. 6796 - 6805 (2007/10/03)
The details of a convergent total synthesis of (+)-mycalamide A are descri7bed. Yb(OTf)3-TMSCl-catalyzed cross-aldol reaction conditions are used to synthesize the right segment of mycalamide A. In this reaction, an acid-sensitive aldehyde reacts with methyl trimethylsilyl dimethylketene acetal without epimerization to provide the desired aldol adduct. Additionally, a tetrahydropyran ring, which is the left segment of mycalamide A, is prepared using a novel one-pot δ-lactone formation methodology. Both segments are constructed from a common starting material, D-mannitol. These segments are then coupled in the presence of BuLi, and the functional groups are transformed to complete the synthesis of (+)-mycalamide A.
Total synthesis of (+)-mycalamide A
Kagawa, Natsuko,Ihara, Masataka,Toyota, Masahiro
, p. 875 - 878 (2007/10/03)
A convergent total synthesis of (+)-mycalamide A is described. A Yb(OTf)3-TMSCl catalytic system is used to synthesize a trioxadecalin ring system, which contains the right segment of mycalamide A. In addition, a tetrahydropyran ring, which is
Synthesis of substituted tetrahydrofuran by electrophile-induced cyclization of 4-pentene-1,2,3-triols - An example of 5-exo versus 5-endo cyclization governed by the electrophile
Bravo, Fernando,Castillon, Sergio
, p. 507 - 516 (2007/10/03)
Differently protected 4-pentene-1,2,3-triols 5-8 were obtained from glyceraldehyde and submitted to iodine-based electrophile-induced cyclization to give tetrahydrofuran derivatives 10 and 18, with high chemo-, regio-, and stereo-selectivity, through a 5-exo cyclization process. However, when an electrophilic selenium reagent was treated with similar alkene triols 5, 7, and 8, the product depended on the protecting group at the primary hydroxy moiety. Thus, while compounds 5a and 5b, unprotected at the primary hydroxy group, give compounds 26 and 27, and 32 and 33, respectively, through a 5-exo cyclization process, compounds 7 and 8, protected at the primary hydroxy group, give the 5-endo cyclization products 22-25 and 28-31 in good yields. The electrophile-induced cyclization of 4-pentene-1,2,3-triols to give tetrahydrofuran derivatives can be directed towards a 5-exo process by the use of iodine or, when the primary hydroxy group is unprotected, selenium. When the primary hydroxy group is protected, use of selenium results in 5-endo cyclization.
Synthesis of erythro and threo furanoid glycals using 5-endo-trig selenoetherification as key step
Bravo,Kassou,Castillon
, p. 1187 - 1190 (2007/10/03)
Differently protected erythro and threo furanoid glycals were synthesised from 4-pentene-1,2,3-triol, through selenium induced 5-endo-trig cyclization and selenoxide elimination.
Stereoselective Synthesis of D-Erythrose and D-Threose Derivatives from D-Glyceraldehyde Acetonide and their Reactions with 1-(Trimethylsilyl)vinyl Cuprate Reagent. Synthesis of Allitol Hexaacetate
Kusakabe, Masato,Sato, Fumie
, p. 1473 - 1476 (2007/10/02)
A new and efficient route to the synthesis of trialkoxy derivatives of D-erythrose (1) and D-threose from readily available D-glyceraldehyde acetonide was developed.The addition reaction of 1 with 1-(trimethylsilyl)vinyl cuprate reagent proceeded highly stereoselectively to afford anti addition product, which was then readily converted into allitol hexaacetate.
