Habrant, Damien published the artcileTowards the total synthesis of calyculin C: preparation of the C9-C25 spiroketal-dipropionate unit, Computed Properties of 99438-28-5, the publication is Organic & Biomolecular Chemistry (2010), 8(19), 4364-4373, database is CAplus and MEDLINE.
An asym. synthesis of the C9-C25 spiroketal fragment of calyculin C is described. Key steps include two crotylation reactions using successively Brown’s reagent and (Z)-crotyltrifluorosilane for the formation of the anti, anti, anti stereo-tetrad, ynone formation by a Pd-catalyzed coupling of a thiol ester with a terminal alkyne and a double intramol. hetero-Michael addition for the stereoselective construction of the spiroketal framework.
Organic & Biomolecular Chemistry published new progress about 99438-28-5. 99438-28-5 belongs to ethers-buliding-blocks, auxiliary class Chiral,Aliphatic cyclic hydrocarbon, name is (+)-B-Methoxydiisopinocampheylborane, and the molecular formula is C21H37BO, Computed Properties of 99438-28-5.
Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem