Três novos análogos espirostânicos de brassinosteróides foram sintetizados pela primeira vez a pa... more Três novos análogos espirostânicos de brassinosteróides foram sintetizados pela primeira vez a partir de diosgenina: (25R)-2α,3α-epoxi-5α-hidroxiespirostan-6-ona (3), (25R)-2β,3α,5α-triidroxiespirostan-6-ona (5) e (25R)-2β-metoxi-3α,5α-diidroxiespirostan-6-ona (6). A substância 3 mostrou acentuada atividade promotora de crescimento vegetal no bioensaio de elongação do hipocótilo e expansão do cotilédone de rabanete, enquanto a substância 6 mostrou-se fitotóxica. Three new spirostanic brassinosteroid analogues have been synthesized for the first time from diosgenin: (25R)-2α,3α-epoxy-5α-hydroxyspirostan-6-one (3), (25R)-2β,3α,5α-trihydroxyspirostan-6-one (5) and (25R)-2β-methoxy-3α,5α-dihydroxyspirostan-6-one (6). In the radish hypocotyl elongation and cotyledon expansion bioassay compound 3 showed plant growth promoting activity whereas 6 was shown to be phytotoxic.
A new (22R,23R)-22,23-epoxy-3β,5α-dihydroxy-stigmastan-6-one brassinosteroid analogue has been sy... more A new (22R,23R)-22,23-epoxy-3β,5α-dihydroxy-stigmastan-6-one brassinosteroid analogue has been synthesised from stigmasterol 1 and its activity as a plant growth promoter has been tested.
Três novos análogos espirostânicos de brassinosteróides foram sintetizados pela primeira vez a pa... more Três novos análogos espirostânicos de brassinosteróides foram sintetizados pela primeira vez a partir de diosgenina: (25R)-2α,3α-epoxi-5α-hidroxiespirostan-6-ona (3), (25R)-2β,3α,5α-triidroxiespirostan-6-ona (5) e (25R)-2β-metoxi-3α,5α-diidroxiespirostan-6-ona (6). A substância 3 mostrou acentuada atividade promotora de crescimento vegetal no bioensaio de elongação do hipocótilo e expansão do cotilédone de rabanete, enquanto a substância 6 mostrou-se fitotóxica. Three new spirostanic brassinosteroid analogues have been synthesized for the first time from diosgenin: (25R)-2α,3α-epoxy-5α-hydroxyspirostan-6-one (3), (25R)-2β,3α,5α-trihydroxyspirostan-6-one (5) and (25R)-2β-methoxy-3α,5α-dihydroxyspirostan-6-one (6). In the radish hypocotyl elongation and cotyledon expansion bioassay compound 3 showed plant growth promoting activity whereas 6 was shown to be phytotoxic.
A new (22R,23R)-22,23-epoxy-3β,5α-dihydroxy-stigmastan-6-one brassinosteroid analogue has been sy... more A new (22R,23R)-22,23-epoxy-3β,5α-dihydroxy-stigmastan-6-one brassinosteroid analogue has been synthesised from stigmasterol 1 and its activity as a plant growth promoter has been tested.
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