New Protected Protecting Groups for the 5′-Hydroxy Group of Deoxynucleosides by Use of 2-(Hydroxymethyl)- and 2-[(Methylamino)methyl]benzoyl Skeletons and Oxidatively Cleavable Tritylthio and (4-Methoxytrityl)thio Groups
作者:Kohji Seio、Eri Utagawa、Mitsuo Sekine
DOI:10.1002/hlca.200490207
日期:2004.9
The newprotectinggroups 1a,b and 2a,b were developed for the 5′-OH group of deoxynucleosides by utilizing the unique characters of the sulfenate and sulfenamide linkage. These newprotectinggroups have a 2-(hydroxymethyl)benzoyl or 2-[(methylamino)methyl]benzoyl skeleton whose hydroxy O-atom or amino N-atom was blocked with a tritylthio-type substituent. They are removable by intramolecular cyclization
A NEW PROTECTING GROUP FOR THE 5′-HYDROXYL GROUP HAVING O–S SINGLE BOND OXIDATIVELY CLEAVABLE UNDER MILD CONDITIONS
作者:Eri Utagawa、Kohji Seio、Mitsuo Sekine
DOI:10.1081/ncn-200059288
日期:2005.4.1
We developed a newprotectinggroup, i.e., cis-[4-[[(4-methoxytrityl)sulfenyl]oxy]tetrahydrofuran-3-yl]oxycarbonyl (MTFOC), which could be removed under neutral conditions involving the oxidative removal of the MMTrS group followed by the self-cyclization of the resulting intermediate. The introduction of the protectinggroup into the 5′-hydroxylgroup of a thymidine derivative and its deprotection
We examined the synthesis of oligodeoxynucleotides containing all four nucleobases using the 4-methoxytritylthio (MMTrS) group for protection of the 5′-hydroxyl group. The MMTrS group could be introduced into 3′-O-TBDMS-deoxycytidine, -deoxyadenosine and -deoxyguanosine with the appropriate base protecting groups using strongbases such as n-butyl lithium and lithium hexamethyldisilazide. Because the