Paterson, Ian published the artcileStudies in marine macrolide synthesis: synthesis of a C16-C28 subunit of spongistatin 1 (altohyrtin A) incorporating the CD-spiroacetal moiety, Formula: C21H37BO, the publication is Tetrahedron Letters (1997), 38(51), 8911-8914, database is CAplus.
The C16-C28 ketone I, containing the CD-spiroacetal of spongistatin 1, was prepared in 17 steps from the aldehyde Me3CSiMe2OCH2CH2CHO. Both thermodn. and kinetic conditions were explored for controlling the CD-acetal configuration.
Tetrahedron Letters 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, Formula: C21H37BO.
Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem