Li, Yingfa published the artcileA formal synthesis of ionomycin featuring a permanganate-mediated oxidative cyclisation, Quality Control of 99438-28-5, the publication is Synthesis (2011), 104-108, database is CAplus.
Key steps in a synthesis of the C17-C32 fragment (I) of ionomycin are (a) an auxiliary-directed oxidative cyclization of a diene with potassium permanganate to construct a THF ring and four stereogenic centers in a single operation, and (b) a chain-appendage reaction featuring the alkylation of an enolsilane by an oxocarbenium ion generated from a 2-phenylsulfonyl-substituted THF.
Synthesis 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, Quality Control of 99438-28-5.
Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem